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Applied Optics

Tunable optical delay with low intensity loss in a cascade structure Er3+-doped optical fiber amplifier

Yuan Gao, Wei Qiu, Yuqi Wu, Xian Zhang, Zhi Li, Pin Lv, Qiuli Jiang

Published Jun 26, 2019• 0 citations
Publisher

Abstract

In this paper, we propose a new pumping scheme—a dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber based on the theory of coherent population oscillation. While realizing slow light transmission, the loss of output signal light power is reduced. Using numerical simulation, we compare the effects of a single fiber without pumping, a 980 nm single pumping single fiber, and a dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber on signal light intensity loss coefficient τ and maximum time delay with the increase of input signal light power. The results show that the signal light intensity loss coefficient τ of the three structures decreases gradually with the increase of input signal light power. However, the transmission of lower signal light intensity loss coefficient τ=0.0823 and a larger time delay of 0.15 ms can be obtained under the dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber. On the basis of the dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber, the signal light intensity loss coefficient τ decreases gradually with the increase of pump ratio M (M=P1480∶P980) and the decrease of length ratio N (N=L2∶L1; L1 and L2 represent the length of the first and second cascaded optical fibers, respectively). Moreover, we compare the effects of ion density of the Er3+-doped optical fiber on the time delay of three structures. The dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber can provide a larger time delay and smaller signal light intensity loss coefficient τ at low ion density of the Er3+-doped optical fiber.

DOI
10.1364/ao.58.005257

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In this paper, we propose a new pumping scheme—a dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber based on the theory of coherent population oscillation. While realizing slow light transmission, the loss of output signal light power is reduced. Using numerical simulation, we compare the effects of a single fiber without pumping, a 980 nm single pumping single fiber, and a dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber on signal light intensity loss coefficient τ and maximum time delay with the increase of input signal light power. The results show that the signal light intensity loss coefficient τ of the three structures decreases gradually with the increase of input signal light power. However, the transmission of lower signal light intensity loss coefficient τ=0.0823 and a larger time delay of 0.15 ms can be obtained under the dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber. On the basis of the dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber, the signal light intensity loss coefficient τ decreases gradually with the increase of pump ratio M (M=P1480∶P980) and the decrease of length ratio N (N=L2∶L1; L1 and L2 represent the length of the first and second cascaded optical fibers, respectively). Moreover, we compare the effects of ion density of the Er3+-doped optical fiber on the time delay of three structures. The dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber can provide a larger time delay and smaller signal light intensity loss coefficient τ at low ion density of the Er3+-doped optical fiber.
In this paper, the general theory of generating fast light and slow light in erbium-doped fiber by hybrid pump cascade structure based on coherent population oscillation effect is given. Through numerical simulation, the effects of pump optical power ratio ([Formula: see text]) on gain, group-induced refractive index [Formula: see text], time delay and fractional delay of pumping structure (1480 and 980[Formula: see text]nm) and pumping structure (980 and 1480[Formula: see text]nm) are studied and analyzed. The effects of pumping structure and pumping direction on time delay, fractional delay and fast/slow light conversion are discussed. In addition, the effects of different pump optical power ratios ([Formula: see text]) on time delay and fractional delay are also discussed. Compared with previous methods such as changing the interaction length and doping ion density, a more suitable optical transmission speed can be obtained by adjusting pump composition, pump direction and pump ratio ([Formula: see text]). This may lead to the optimization of optical communication systems.
Abstract Slow light is demonstrated in the cascade structure of an erbium-doped fiber with two forward propagation pumps. The results of the numerical simulation of the time delay and the optimum modulation frequency complement each other. The time delay and the optimum modulation frequency depend on the pump ratio G ( G = P 1480 : P 980 ). The discussion results of this paper show that a larger time delay of slow light propagation can be obtained in the cascade structure of Er 3+ -doped optical fibers with dual-frequency laser pumping. Compared to previous research methods, the dual-frequency laser-pumped cascade structure of an Er 3+ -doped optical fiber is more controllable. Based on our discussion the pump ratio G should be selected in order to obtain a more appropriate time delay and the slowdown of group velocity.
Abstract In this paper, we propose a general theory for the coherent population oscillation effect in an -doped optical fiber under dual-frequency laser pumping at room temperature. We aim at comparing the effect of dual pumping (1480 nm and 980 nm) with single pumping of 980 nm and single pumping of 1480 nm on time advancement. According to the numerical calculations, we analyze the relationships between relative modulation attenuation and modulation frequency, plus fractional advancement and modulation frequency under the dual-frequency pumping laser with co-propagation. Compared to single pumping, a greater change in the group refractive index can be found. The maximum time advancement of 0.24 ms under a dual-frequency pump laser with co-propagation is obtained. Moreover, we demonstrate the influence of the pump ratio M on time advancement with modulation frequencies of 40 Hz, 100 Hz and 200 Hz. The ability to control the group velocity of light could have an important application for photonics.
Abstract In this article a general theory of the coherent population oscillation effect in an erbium-doped fiber at room temperature is presented. We use dual pumping light waves with a simplified two-level system. Thus the time delay equations can be calculated from rate equations and the transmission equation. Using numerical simulation, in the case of dual-frequency pump light waves (1480 nm and 980 nm) with two directions, we analyze the influence of the pump power ratio on the group speed of light propagation. In addition, we compare slow light propagation with a single-pumping light and slow light propagation with a dual-pumping light at room temperature. The discussion shows that a larger time delay of slow light propagation can be obtained with a dual-frequency pumping laser. Compared to previous research methods, a dual-frequency laser pumped fiber with two directions is more controllable. Moreover, we conclude that the group velocity of light can be varied by changing the pump ratio.
-doped fiber under a dual-frequency pumping laser. Using the numerical calculations, we study the effect of the pump power ratio (M) on the time delay and the group velocity of slow light propagation. The maximum time delay of 0.70 ms under a dual-frequency pump laser with two directions is obtained. Compared with a single pump method, the time delay can be increased with dual-frequency laser pumping. Moreover, we demonstrate clearly the influence of M on the maximum fractional delay and the optimal modulation frequency with an input signal power of 4.0 mW.
The slow light propagation in optical fiber has attracted much attention because of its practical applications. Use of coherent population oscillation to produce slow light propagation has many advantages over other methods. We investigate the reduction of the group velocity propagation by the coherent population oscillation in erbium-doped optical fiber, and also the relationship between the population of metastable state and the time delay by changing the doping concentration, the length of the fiber, the input power, and the pump power. The results show that we can select a high doping concentration of erbium in the fiber, increase the length of the fiber, decrease the pump power and select the appropriate power of the signal light to increases the time delay.